diff --git a/www/admin/smarty.inc b/www/admin/smarty.inc
index b6b7707e..c56a25cc 100644
--- a/www/admin/smarty.inc
+++ b/www/admin/smarty.inc
@@ -90,7 +90,7 @@ $cms->DEBUG_DATA['DEBUG'] = @$DEBUG_TMPL;
 // create main data array
 $cms->CONTENT_DATA = array_merge($cms->HEADER, $cms->DATA, $cms->DEBUG_DATA);
 // data is 1:1 mapping (all vars, values, etc)
-while (list($key, $value) = each($cms->CONTENT_DATA)) {
+foreach ($cms->CONTENT_DATA as $key => $value) {
 	$smarty->assign($key, $value);
 }
 if (is_dir(BASE.TEMPLATES_C)) {
diff --git a/www/layout/admin/default/css/edit.css b/www/layout/admin/default/css/edit.css
index 695b93bb..a889bff2 100644
--- a/www/layout/admin/default/css/edit.css
+++ b/www/layout/admin/default/css/edit.css
@@ -272,7 +272,7 @@ input[type="text"]:focus, textarea:focus, select:focus {
 }
 
 /* spacer for line break in float elements */
-.spacer {
+.clr, .spacer {
 	clear: both;
 }
 
diff --git a/www/lib/CoreLibs/ACL/Login.inc b/www/lib/CoreLibs/ACL/Login.inc
index 5cb96a91..663a9ee9 100644
--- a/www/lib/CoreLibs/ACL/Login.inc
+++ b/www/lib/CoreLibs/ACL/Login.inc
@@ -958,14 +958,14 @@ EOM;
 		}
 
 		// first check if all strings are set from outside, if not, set with default ones
-		while (list($string, $data) = each($strings)) {
+		foreach ($strings as $string => $data) {
 			if (!array_key_exists($string, $this->login_template['strings'])) {
 				$this->login_template['strings'][$string] = $data;
 			}
 		}
 
 		// error msgs the same
-		while (list($code, $data) = each($error_msgs)) {
+		foreach ($error_msgs as $code => $data) {
 			if (!array_key_exists($code, $this->login_error_msg)) {
 				$this->login_error_msg[$code] = $data;
 			}
diff --git a/www/lib/CoreLibs/Basic.inc b/www/lib/CoreLibs/Basic.inc
index 2973a943..8b098e77 100644
--- a/www/lib/CoreLibs/Basic.inc
+++ b/www/lib/CoreLibs/Basic.inc
@@ -123,7 +123,7 @@ class Basic
 	private $log_print_file = 'error_msg##LOGID####LEVEL####CLASS####PAGENAME####DATE##';
 	private $log_file_unique_id; // a unique ID set only once for call derived from this class
 	public $log_print_file_date = 1; // if set add Y-m-d and do automatic daily rotation
-	private $log_file_id = LOG_FILE_ID ? LOG_FILE_ID : ''; // a alphanumeric name that has to be set as global definition
+	private $log_file_id = ''; // a alphanumeric name that has to be set as global definition
 	public $log_per_level = 0; // set, it will split per level (first parameter in debug call)
 	public $log_per_class = 0; // set, will split log per class
 	public $log_per_page = 0; // set, will split log per called file
@@ -179,9 +179,30 @@ class Basic
 			"class_author" => 'Clemens Schwaighofer'
 		);
 
+		// before we start any work, we should check that all MUST constants are defined
+		$abort = false;
+		foreach (array(
+			'DS', 'DIR', 'BASE', 'ROOT', 'LIB', 'INCLUDES', 'LAYOUT', 'PICTURES', 'FLASH', 'VIDEOS', 'DOCUMENTS', 'PDFS', 'BINARIES', 'ICONS',
+			'UPLOADS', 'CSV', 'JS', 'CSS', 'TABLE_ARRAYS', 'SMARTY', 'LANG', 'CACHE', 'TMP', 'LOG', 'TEMPLATES', 'TEMPLATES_C',
+			'TEMPLATES_FRONTEND', 'DEFAULT_TEMPLATE', 'DEFAULT_TEMPLATE_FILE', 'DEFAULT_LANG', 'DEFAULT_ENCODING', 'DEFAULT_HASH',
+			'DEFAULT_ACL_LEVEL', 'LOGOUT_TARGET', 'PASSWORD_CHANGE', 'AJAX_REQUEST_TYPE', 'USE_PROTOTYPE', 'USE_SCRIPTACULOUS', 'USE_JQUERY',
+			'PAGE_WIDTH', 'MASTER_TEMPLATE_NAME', 'PUBLIC_SCHEMA', 'TEST_SCHEMA', 'DEV_SCHEMA', 'LOGIN_DB', 'MAIN_DB', 'DB_SCHEMA',
+			'LOGIN_DB_SCHEMA', 'GLOBAL_DB_SCHEMA', 'TARGET', 'DEBUG', 'SHOW_ALL_ERRORS'
+		) as $constant) {
+			if (!defined($constant)) {
+				echo "Constant $constant misssing<br>";
+				$abort = true;
+			}
+		}
+		if ($abort === true) {
+			die('Core Constant missing. Check config file.');
+		}
+
 		// set the page name
 		$this->page_name = $this->getPageName();
 		$this->host_name = $this->getHostName();
+		// init the log file id
+		$this->log_file_id = defined('LOG_FILE_ID') ? LOG_FILE_ID : '';
 
 		// set the paths matching to the valid file types
 		$this->data_path = array (
@@ -328,7 +349,7 @@ class Basic
 		// initial the session if there is no session running already
 		if (!session_id()) {
 			// check if we have an external session name given, else skip this step
-			if (SET_SESSION_NAME) {
+			if (defined('SET_SESSION_NAME')) {
 				// set the session name for possible later check
 				$this->session_name = SET_SESSION_NAME;
 			}
@@ -434,7 +455,7 @@ class Basic
 	// DESC  : wrapper around microtime function to print out y-m-d h:i:s.ms
 	public static function printTime($set_microtime = -1)
 	{
-		list($microtime, $timestamp) = explode(" ", microtime());
+		list($microtime, $timestamp) = explode(' ', microtime());
 		$string = date("Y-m-d H:i:s", $timestamp);
 		// if microtime flag is -1 no round, if 0, no microtime, if >= 1, round that size
 		if ($set_microtime == -1) {
diff --git a/www/lib/CoreLibs/DB/IO.inc b/www/lib/CoreLibs/DB/IO.inc
index c316eb17..7fd2be45 100644
--- a/www/lib/CoreLibs/DB/IO.inc
+++ b/www/lib/CoreLibs/DB/IO.inc
@@ -501,7 +501,7 @@ class IO extends \CoreLibs\Basic
 	// NOTE  : used in db_dump_data only
 	private function __printArray($array)
 	{
-		while (list($key, $value) = each($array)) {
+		foreach ($array as $key => $value) {
 			$string .= $this->nbsp.'<b>'.$key.'</b> => ';
 			if (is_array($value)) {
 				$this->nbsp .= '&nbsp;&nbsp;&nbsp;';
@@ -1111,7 +1111,7 @@ class IO extends \CoreLibs\Basic
 					$this->cursor_ext[$md5]['read_rows'] ++;
 					// if reset is <3 caching is done, else no
 					if ($reset < 3) {
-						while (list($field_name, $data) = each($return)) {
+						foreach ($return as $field_name => $data) {
 							$temp[$field_name] = $data;
 						}
 						$this->cursor_ext[$md5][] = $temp;